ABSTRACT

The ecology and biogeography of the invertebrate epifauna related to floating Sargassum in the East China Sea were studied. Floating algal rafts composed of only Sargassum horneri (Turner) C. Agardh were collected in the East China Sea in March 2012 when the rafts were distributed not only on the continental shelf but also, unusually, south and east of the Kuroshio Current in the Pacific Ocean. In total, 71 samples collected at 11 stations were studied. Of the 11 invertebrate taxa recognized, harpacticoid copepods were most abundant, followed by malacostracans, and cirripedes. The densities of these three taxa were higher than those of other invertebrates. The number of invertebrate taxa was not correlated with the algal wet weight. There were more invertebrate taxa in the coastal area around Amami-Oshima Island than in other areas. The trajectories of drifting buoys indicated that the algal rafts collected in this area floated longer than those in other areas, allowing the colonization of invertebrates from the surrounding water.

摘要

研究了东海与浮游马尾藻有关的无脊椎动物底栖动物的生态和生物地理学。仅由马尾藻组成的漂浮藻筏(Turner) C. Agardh 于 2012 年 3 月在东海收集，当时筏不仅分布在大陆架上，而且异常地分布在太平洋黑潮洋流的南部和东部。总共研究了在 11 个站点收集的 71 个样本。在已识别的 11 种无脊椎动物类群中，棘状桡足类最为丰富，其次是角鲨类和卷足类。这三个类群的密度高于其他无脊椎动物。无脊椎动物分类群的数量与藻类湿重无关。奄美大岛周边沿海地区的无脊椎动物类群比其他地区多。漂流浮标的轨迹表明，该地区收集的藻筏比其他地区漂浮的时间更长，